The path of a light ray through a refracting surface is reversible
Indicate whether the statement is true or false
F
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The scientific method is a ___________________ by which scientists form hypotheses and test them agains evidence gathered by observation or experiment
Fill in the blank(s) with correct word
A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, its total mechanical energy is 140 J
To what vertical height above the ground does it rise, assuming no air resistance? A) 10 m B) 24 m C) 1.0 m D) 14 m
When a current is induced by a changing magnetic field B1, the current always produces a second magnetic field B2 such that
A. B1 and B2 completely cancel each other out. B. B1 and B2 combine to give a weaker magnetic field than B1 alone. C. B1 and B2 combine to give a stronger magnetic field than B1 alone. D. It is not possible to tell whether the combined field is stronger or weaker than B1 without knowing how B1 is changing
A series LRC ac circuit has a resistance of 4.0 k?, a capacitance of 33.0 ?F, and an inductance of 23.0 H. If the frequency of the alternating current is 2.0/? kHz, what is the phase angle between the voltage and the current?
A) -1.6 rad B) 23 rad C) 3.1 rad D) 1.5 rad